The tokenizer uses the default delimiter set, which is" \t\n\r\f": the space character, the tab character, the newline character, the carriage-return character and the form-feed character.
I think they forgot to mention the other default delimiters...
Or maybe characters like '\t', '\n', '\r', and '\f' are considered to be all whitespace characters as well, besides the (very obvious) space character.
In the Character class, you'll have a isWhitespace(char) method. So let's see what this method returns for these characters. Here's the code snippetOutput:
Here you'll find the javadoc of this method. And in the javadoc of the Pattern class, you'll see that those characters are considered a whitespace character as well. So every character of the default delimiter set is a whitespace character, so I think it's safe to say the statement in the study guide is spot-on.